Apparatus for the reproduction, regulation, and control of temperatures



Dec. 26, 1939.

W. E. STONE APPARATUS FOR THE REPRODUCTION, REGULATION, AND CONTROL OF TEMPERATURES Filed March 4. 1938 2 Sheets-Sheet 1 Dec. 26, 1939. w, STONE 2,184,859 APPARATUS FOR THE REPRODUCTION, REGULATION, AND CONTROL OF TEMPERATURES 2 Sheets-sheaf 2 Filed March 4. 193a dorm,

Patented Dec. 26, 1939 UNITED :S'TATES' APPARATUS ron THE anrnonuo'rron, REGULATION, AND coN'moL or TEMPER- ATURES William E. stone, was Anahuac, n. n, Maxi-I co; dedicated tothe free use of the People of the United States of America Application March ,4, 193 Serial No. 193,846

" 2 Claims. m. ass-4s) (Granted under the act of March 3, 188d, as amended April. 30, 1928; 370 0., G. 757) This application is made under the act of March 3, 1883, as amended by the act of April 30, 1928, and the invention herein described and claimed, if patented, may be manufactured and used by or for the Government of the United States for governmental purposes without the payment to ,me of any royalty thereon.

I hereby dedicate the invention herein described to the free use of the people of the United States of America to take effect on the granting of a patent to me.

This invention relates to an instrument for controlling, regulating, and reproducing te peratures.-

One of the objects of this invention is to provide an instrument of the type mentioned that will enable animal and plant life to be subjectedin a laboratory to the diurnal variations of habitats, and finds an important use in the study of insect pests, especially fruit flies, existing outside the boundaries of the United States in relation to the possibility of the survival of these flies under variable temperatures to which they may be exposed should they invade the United States.

Another object of this invention is to provide a means for the control of electrically heated cabinets and for processing or conditioning rooms requiring agradually decreasing rise in temperature for a definite period and a constant temperature thereafter without the use of pressure controls.

Still another object of this invention is to provide an instrument of the type mentioned which will enable determination of developments of insects under constant temperatures in contrast to variable temperatures, of which the constant a temperature in any the mean.

A further object of this invention is to provide a means for the control of variable temperatures during a definite period,according to a prearranged plan of gradual rise or fall in temperature charted on a recorder as a straight line,, or a gradual decrease of rise or fall in temperature charted in the form of a curve.

A still further object of this invention is to produce an instrument of the type mentioned that is inexpensive, of simple constructionand particular case represents which maybe easily adjustedto reproduce records from any type of daily or weekly drum temperature recorder or temperature pattern.

Another and still further object of this invention is to provide an instrument of the type menother.

tioned which is portable so thatit can be quickly transferred from one operating location to an-' The following description, considered together with the accompan g drawings, will disclose this invention more fully, its construction and operation of parts, and further objects and'advantages thereof will be apparent.

- In the drawings:

vention in one of ts rms.

Figure 2 is a plan of Figure 1.

Figure 3 is an end view of Figure 1.

Figure 4 is an end view of Figure 1 opposite to that of Figure 3.

Referring with more particularity to the"drawings in which like numerals designate like parts, a cylinder I rotatively responsive to a motivat- Figure 1 is a. siwtional view gof this ining unit (not shown) disposed therein, is ve cally mounted on the base 2 of thbrinstruirgifi" and may be of any of the ordinary types general use on thermographs,-such as the clock type. This cylinder is adapted tohavedisposed about itslateral surface afiber board chart pat tern 3 of approximately 1 millim ter, or slightly less, in thickness, and is attached. rrLthe manner of an ordinary thermograph chart. In the drawings this fiber-board chart is shown mounted on the cylinder 1 and held in place by meansof a removable band 4. I

A vertical shaft 5 is fixedly mounted to the base of the "strument substantially as shown, and carries a orizontal supporting plate 6 ad-' justably fixed said shaft by means of a collar 1 and set screw Pairs of vertical brackets 9, 9 and "I, II) are se red in the manner shown. The brackets. 9, 9 surt an adjustable tracing arm ll, fulcrumed befin said brackets on a threaded horizontal shaft I2 means of simple point and socket bearings 13, I Being mounted on the threaded shaft l2 said tra'ng armis made laterally adjustable. Said tracing arm is also adjustable in length, being com osed of two parts fitted together by means of slot 16 and set screws l5, l5. At the outer end ofsaid tracing arm, a tracing point l6 of steel wlre, or any other suitable material, is attached by means of a connecting wrist l1 and is designed to follow the contour of the chart pattern 3.

In a manner similar to t at of the tracing arm H, a lever- IB is fulc d tween the brackets l0, Ill. The longer arm of this layer extends upward. and is smureif'to a segmental are I! of approximately degrees, substantially as shown. At the. .llpp f end of this segmental arc a wire 20 is attached, preferably No. 38 insulated 2 copper magneto wife, but any other suitable wire maybe employed, and is designed to fall in registry with a fine groove 2i, extending the entirelength. of the arc segment in the middle of its The chart pattern 3 is prepared and secured periphery. The other end of this wire carries a weighted platinum pointed contact drop 22 .extending to a mechanically actuatable thermostat 23.

The tracing arm H andthe' lever III are mechanically linked by means of a main adjustment rod and a minor'adjustment rod 2!. One end of the rod 24 is flxed to the arm Ii at a point between its ends; the other end being pivoted to one end of the rod 25 The other end of said rod 25 is pivoted to the short arm of the; lever 18, substantially as shown. Both of said rods 24 and25are made adjustable in length by means of threaded spacers 26 and 21, set in threadedsockets 28, 28 and 29, 29. One-half of each of the spacers 26 and 21 are threaded in one direction, and the other half in. the opposite direction. In order to delicately balance this instrument, a counter-weight 30 is adjustably mounted on the bearing shaft of the lever I. by

means of a collar 3|. Balancing the instrument in this way makes it kinematically constrained.v

A vertical guide bar 32 is fixed to a lever 33, which lever has a handle 24 and is pivotally mounted at the base of the instrument near the cylinder 'L. The object of this guide bar is to hold the point of the tracer arm II in proper operating position with respect to the edge of the fiber-board pattern 3.

Threaded legs 35, 35, I8, 35. are provided for the purpose of making placement adjustments for the instrument.

The operation of this invention is as follows:

about the cylinder I in the manner shown in the drawings and above described. The instrument is then adjusted for the particular pattern,-the

initial adjustment consisting of lengthening or shorteningthe tracing arm II so that the are described by the tracing point, when in motion, is of the same radius as the temperature arcs on the chart pattern. The movable stage is then raised or lowered until the arc described by the tracing point and the temperature are of the.

chart pattern exactly coincide ata point at the front and. center of the chart pattern. The last adjustment consists of lengthening or shortening the main adjustment rod 24 until the distance traversed by the contact drop 22 as a result of the movement of the tracer-point l8 through the number of degrees represented by the chart pattern [is equivalent tothe rise and fall of mertracing point is then rested-on the top edge of the fiber-board pattern and'as the clock rotates, it follows the pattern raising or lowering the tracing arm. Said tracing arm actuates the rod 24, which in turn actuator the rod 25 and con-v sequently the arc segment is. Thus the drop contact is raised or lowered with the movement of the tracing point. The usual means of a relay equipped with a mercoid contactor may'be employed to turnthe heat on and oil.

Having thus described my invention, I claim:

1. A device for use in the reproduction and con-' trol of temperatures-comprising a vertically disposed cylinder actuatable by means of a clock mechanism, an adjustable tracing arm vertically mounted between brackets on a vertically ad.-

justable plate, a pointer carried by said arm adapted to rest on and be responsive to the edge ofa-- flber-board pattern wrapped around said cylinder, a lever fulcrumed between additional brackets onsaid vertically. adjustable plate having a long arm extending upward and a short arm extending downward, a segmental arc of substantially degrees having a longitudinally groovedperiphjery securedat the end of the long. arm of said lever, a weighted contact drop of ,a thermostat suspended from'the upper end of said segmental are on an electrically insulated wire,

adjustable mechanical means connecting said tracing arm' and the shorter arm of said lever, and means for mechanically balancing'the instrument.

Y 2. A deviceof the character described comprisv ing a cylinder actuatable by a clock mechanism,.

a. tracing arm, a pointer carried by said arm responsive to. theedge of a fiber-board patternwrapped. around said cylinder, a lever having one arm linked to said tracing arm, a segmental arc to the other arm of said lever, and a; weighted contact drop of a thermostat suspended,-

from' the upper end of said segmental are, whereby said weighted contact drop is responsive to the movements of said pointer.

-w. as'rom 1- 

